Felo
Felo

Free AI Image Prompt Generator — GPT Image 2.5

Guide d'utilisation

What is the GPT Image 2.5 Prompt Generator?

It turns a rough idea — or a reference photo — into a complete, production-ready prompt for GPT Image 2.5. Describe what you want and you get back a structured prompt covering subject, composition, lighting, materials, exact text, and the exclusions that keep stray words and watermarks out of your image. Built on OpenAI's official image prompting guidance, and free to use.

Key Features

  • Generate structured prompts from a one-line idea — go from "cozy bakery logo" to a full spec with composition, palette, typography, and negatives.
  • Render exact text reliably — required copy is quoted verbatim, positioned, and counted, so taglines come out legible instead of garbled.
  • Write edits that protect what matters — upload a photo and get a "change only this, preserve everything else" prompt that guards identity, geometry, and lighting.
  • Assign roles to reference images — it tells the model which image is the subject, which carries the style, and which supplies packaging or background.
  • Recommend the settings — every prompt ships with a model, quality, size, and background recommendation, so you know what to run before you spend on it.
  • Render on request — ask for the image and the agent generates it with GPT Image 2.5 right in the chat.

Photorealistic product photography prompt
Poster prompt with exact tagline text

Prompt in, image out. The photo above came from this prompt:

Photorealistic product photograph of a matte ceramic pour-over dripper on a warm stone
countertop. Shot like a real 50mm photograph, close-up at a slight three-quarter angle,
soft morning window light from the left, shallow depth of field, faint steam, believable
stone and glaze texture, no text, no watermarks.

How to Use

  1. Describe the image you want in one or two sentences — the subject, the mood, and where it will be used. Plain language is enough.
  2. Copy the prompt. Keep or adjust the recommended settings line if you plan to run it through the API yourself.
  3. Ask the agent to render it if you want to see the result, or tell it what to change and it rewrites the prompt.

Example Use Cases

  • Product photography without a studio — a photorealistic product shot prompt for an e-commerce listing, with believable materials, contact shadows, and a clean background.
  • Posters and ads with exact copy — an ad prompt that renders your tagline once, legibly, in the right place, with no random text.
  • Classroom and process diagrams — a labeled diagram prompt with readable labels, one consistent icon style, and enough white space to scan quickly.
  • Logo concepts — a simple, original logo prompt on a transparent background that still reads clearly at small sizes.
  • One-change photo edits — upload a photo and get an edit prompt that swaps a single object while preserving camera angle, shadows, and surroundings.

Infographic prompt for a four-step process

Tips for Best Results

  • Name the intended use, not just the subject. "Product photograph for an e-commerce listing" steers the result differently than "a photo of a bottle."
  • Put required text in quotes and say how many times it should appear, then check the spelling in the output.
  • Prefer visible detail over mood words — "soft directional window light from the left" beats "beautiful lighting."

FAQ

What inputs does it accept, and how long can they be?
Type a one-line idea, paste an existing prompt you want repaired, or upload a PNG, JPEG, or WebP photo to edit. There is no limit on how much you write, though one or two sentences covering subject, purpose, and mood gets the strongest prompt.

How accurate are the prompts, and what if I don't like the result?
They follow OpenAI's documented prompting practices, which reliably improve subject accuracy, text legibility, and edit precision. Image models are still probabilistic, so two renders can differ. When a detail drifts, tell the agent in plain language — "warmer light", "wider framing", "smaller text" — and it revises that clause only, then re-renders with the rest of the prompt intact.

How does this compare to a GPT Image 2.5 prompt library, like awesome-gpt-image-2-5?
A prompt library gives you fixed prompts to adapt. This generator writes one prompt for your exact subject, size, and text, then renders it if you want. Use a library for inspiration; use this when you already know what you want to see.

Is it free?
Yes — describe your idea, get the prompt, and render it in the chat without a paid account.

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